Definitely squeal, I mean, talk to your boss about coworkers who order you around without authority. If they get away with it once, they will do it again...and harder!
I have a coworker like that. One time, I got called back into work (15 minute drive) after I had gone home sick, and was on a conference call due to a Major computer outage...he was telling me how to reboot my systems, etc., etc., and I told him that I don't report to him, I know how to do my job better than he does, I was not well, so Leave Me Alone And Let Me Work! After things were resolved, I was informed that he had gotten very angry when I said that, but his boss told him to knock it off!